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Letters Patent No. 107-,711, dated September 27,1870.

w IMPROVEMEN'I' IN TREATING'TIN SCRAP FdR THE 'I VIANUFAC TURE OF'STANNATE OF The Schedule referred to in these Letters Patent and makingpart of the same.

I, ADOLPH Orr, of Ncw York, county and State of New York, have inventeda certain Process for the production of Slannate'of Soda or Stannate oi"Potash from Tinned Sheet-Iron, or the so callcd Tin Scraps, and for theproduction of Wrought-Iron'or tool from the remaining iron scraps, of,which the following is a specification.

In order to prepare the stannate ofsoda or potassa, Iput the tinnedsheet-iron into a suitable vessel, which may be either an iron kettle,such as used in chemical establishments, or into a wooden tub, pro-,

vided with pipes for the introduction of steam. Or, if it is desiredthat the tin scraps should be kept in agitation with the severalingredients, which I shall ne'ntiou presently, 1 put them into a woodenbarrel,

fitted up in such a manner that it can be kept-rotating. This barrel canbe of the same construction as.

those used for the amalgamation of silver ores, but must be sethorizontally. It should also be provided with a pipe for theintroduction of steam.

The vessel being charged with the scraps, I introduce the followingchemicals into the same, namely: for fifty pounds of scraps, eightquarts of a lie of caustic soda, indicating 18 or 20 of Baumshydrometer; ten pounds of litharge or red lead; one pound and a hali' ofnitrate of soda, and' one pound and ahalf of manganate of soda.

If I wish to produce the st'annate of potash, instead of the respectivesoda compound, I take fourteen pounds of alie of caustic potash, twopounds of nitrate of potash, and two pounds of inaugauate of potash, in

lieu of the soda compounds hcreinbefore specified.

These chemicals being introduced into the vessel -\\'ith the tin scraps,I turn on steam and keep the whole boiling until the tin has beenentirclyseparatcd from the iron, which will have taken place in thecourse of a few hours.

Inthis process metallic lead and peroxide of man ganese separate, theformer as a spong mass, while the oxygen held originally by thesebodies,inasmuch as it may be disengaged under the circumstances, is employed inthe conversion of the tin into an oxide of tin or stannic acid, which,in uniting with the respective alkalies, forms a stannate of alkali.

In order to decolorize the liquid obtained, I filter the same throughlinen bags containing bone-black, and evaporate it hereupon in anevaporating-pan until indicating the specific gravity of 18 Baum.

When showing this specificweight, the fire is withdrawn and theliquidallowed to cool; it will then yield t-he'stannate in a crystalizedstate.

The vstannate of soda will be combined with three equivalents of water.After being separated from the mother liquid it isdried and packed. 1

I intend to use the stannates as mordants for woolen, cotton, or linen,for which purpose they are in so far preferable to the ordinarymordants, as brighter colors are produced by them.

In this process, the red lead, as well as the manganese, may be regainedin the following manner:

They are separated from the tin, with which they will remain in theboiling vessel, by turning on a stream of water; hereafter they aretransferred upon filters, and when nearly dry they are mixed with onehalf of their weight of caustic soda or two-thirds of caustic potash. I1

This mixture is exposed to the atmospheric air on arcd-hot iron plate.'lhus red lead and manganate of soda or po ash are again formed, whichwill he again suitable to separate tin from scraps.

In regard to the resulting sheet-iron, I form packets and melt them in aproper furnace by the introduction of generation gases and hot blast,together with a few percent. of peroxide of manganese 'or another properoxygen-yielding substance, which will decalhonize it, and produce atenacious, fine-grained iron,

The same is then worked in the. same manner as blooms from whichwrought-iron is to be produced.

Witnesses:

T110. 1 WELLS, CHAS. SELVAGE.

